Gary Illyes from Google said this morning at his keynote address at Pubcon that Google is creating a separate mobile index, which will ultimately end up being the primary index that they keep current. He added that the desktop index will be the “secondary” index and not be as up-to-date as the mobile index.

Illyes said that when this mobile index goes live, Google will write something about the change on their webmaster blog. There is no estimated time for this mobile index to happen, but it is something Google is working on.

Currently, Google has a primarily desktop index, with some signals that show if there is a valid mobile version of the page. It looks like Google is going to be maintaining two different indexes — mobile and desktop — sometime in the future.

Here are some of the tweets covering what Illyes said at Pubcon:

.@methode: Google creating a sep mobile index, which will be it’s primary index. Desktop will be a secondary index,less up to date #Pubcon